Aiwa Z-L700 Service Manual page 34

ADJUSTMENT <TUNER / DECK / FRONT>
A MAIN C.B
12
3
5
6
7
8
9
10
11
12
13
< TUNER SECTION >
1. Clock Frequency Check
Settings : • Test point : TP2 (CLK)
Method : Set to AM 1710kHz and check that the test point is
2160kHz ± 45Hz.
2. AM VT Check
Settings : • Test point : TP1 (VT)
Method : Set to AM 1710kHz, AM 530kHz and check
that the test point is less than 8.5V (1710kHz) and
more than 0.6V (530kHz).
3. AM Tracking Adjustment
Settings : • Test point : TP8 (Lch), TP9 (Rch)
• Adjustment location :
L951 (1/3) ..................................... 1000kHz
Method : Set to AM 1000kHz and adjust L951 (1/3) so that the
test point is maximum.
4. FM VT Check
Settings : • Test point : TP1 (VT)
Method : Set to FM 108.0MHz and check that the test point is
less than 8.0V.
Set to FM 87.5MHz and check that the test point is
more than 0.5V.
SFR352 SFR351
GND
TP8 (LCH)
TP9 (RCH)
7 6
L802
L801
24
IC801
TP2 (CLK)
5. FM Tracking Check
Settings : • Test point : TP8 (Lch), TP9 (Rch)
Method : Set to FM 98.0MHz and check that the test point is
less than 9.0dBµV.
6. AM IF Adjustment
Settings : • Test point : TP8 (Lch), TP9 (Rch)
• Adjustment location :
L802 ................................................ 450kHz
7. DC Balance / Mono Distortion Adjustment
Settings : • Test point : TP3, TP4 (DC Balance)
• Adjustment location : L801
• Input level : 60dBµV
Method : Set to FM 98.0MHz and adjust L801 so that the
voltage between TP3 and TP4 becomes 0V ± 0.03V.
Next, check that the distortion is minimum
– 34 –
7
L951
TP3
TP4
(1/3)
FFE831
4
TP1
(VT)
TP8 (Lch), TP9 (Rch) (Distortion)
3
2
4
1